WordNet sense 1 (a slogan used to rally support for a cause):

watchword, war cry, battle cry, rallying cry

WordNet sense 2 (a loud utterance of emotion (especially when inarticulate)):

yell

WordNet sense 3 (a loud utterance; often in protest or opposition):

call, outcry, shout, vociferation

WordNet sense 4 (proclaim or announce in public):

blazon out

WordNet sense 5 (utter a sudden loud cry):

holler, scream, squall, hollo, shout out

WordNet sense 6 (utter aloud; often with surprise, horror, or joy):

exclaim, call out, cry out

WordNet sense 7 (shed tears because of sadness, rage, or pain):

weep